feat: Create a new GUI project based on Avalonia. (Powered by Claude)

src/ZonyLrcTools.Desktop/ViewModels/MainWindowViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using ZonyLrcTools.Desktop.Infrastructure.Localization;
+using ZonyLrcTools.Desktop.Services;
+
+namespace ZonyLrcTools.Desktop.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    private readonly IThemeService _themeService;
+    private readonly IUILocalizationService _localization;
+
+    [ObservableProperty]
+    private ViewModelBase? _currentPage;
+
+    [ObservableProperty]
+    private int _selectedNavigationIndex;
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(ThemeButtonText))]
+    private bool _isDarkTheme;
+
+    [ObservableProperty]
+    private string _title = "ZonyLrcTools X";
+
+    // Navigation localized strings
+    public string NavHome => _localization["Nav_Home"];
+    public string NavLyricsDownload => _localization["Nav_LyricsDownload"];
+    public string NavAlbumDownload => _localization["Nav_AlbumDownload"];
+    public string NavSettings => _localization["Nav_Settings"];
+    public string HomeDescription => _localization["Home_Description"];
+
+    public string ThemeButtonText => IsDarkTheme
+        ? _localization["Settings_ThemeLight"]
+        : _localization["Settings_ThemeDark"];
+
+    public MainWindowViewModel(
+        IThemeService themeService,
+        IUILocalizationService localization,
+        HomeViewModel homeViewModel)
+    {
+        _themeService = themeService;
+        _localization = localization;
+
+        // Subscribe to language changes
+        _localization.LanguageChanged += OnLanguageChanged;
+
+        // Set initial page
+        CurrentPage = homeViewModel;
+        SelectedNavigationIndex = 0;
+    }
+
+    private void OnLanguageChanged(object? sender, EventArgs e)
+    {
+        // Notify all localized properties have changed
+        OnPropertyChanged(nameof(NavHome));
+        OnPropertyChanged(nameof(NavLyricsDownload));
+        OnPropertyChanged(nameof(NavAlbumDownload));
+        OnPropertyChanged(nameof(NavSettings));
+        OnPropertyChanged(nameof(HomeDescription));
+        OnPropertyChanged(nameof(ThemeButtonText));
+    }
+
+    [RelayCommand]
+    private void ToggleTheme()
+    {
+        IsDarkTheme = !IsDarkTheme;
+        _themeService.SetTheme(IsDarkTheme
+            ? Avalonia.Styling.ThemeVariant.Dark
+            : Avalonia.Styling.ThemeVariant.Light);
+    }
+}